It depends on the cat

Background:
I have with the move into a new house now a small garden of 200m², which was not really well maintained by the previous tenants. The cats from the neighborhood use this garden unfortunately for the morning toilet (in the middle of the lawn).
In order not to have to resort to radical methods too, I wanted to try it with this product.

Pro:
The product is processed and packaged properly. The batteries (not included) were rapidly deployed and made the product ready for use.
It is important to know that you need a screwdriver here, both for inserting the batteries as well as the attachment of the bottom bracket. The covered area is very large (at maximum setting) and there is any movement detected.
The product is completely weatherproof (stands in an open area and also has recent rainstorm best survived).

Cons:
The sensor detects even the smallest movements like the wind moving blades of grass.
Although most cats be deterred, but it actually seems to give cats whose hearing (through breeding or similar reasons) is not so sensitive that they perceive the sound as unpleasant.
Unfortunately, there is no switch to turn the unit to temporarily disable (for example, when children want to play in the garden).

Conclusion:
The product is worth the money, as long as the animal that you want to drive out, actually responded.
Here, unfortunately, just trying.
One has as a deaf representative of his race, it has unfortunately been unlucky, which is not attributable to the product but.
Unfortunately, it lacks a switch for easy switching on and off.